Deck Framing Guide

The framing is the part of your deck you never see once it is finished, and it is also the part that decides whether the deck feels rock-solid or springy underfoot ten years from now. We’ve inspected hundreds of decks across Hampton Roads, and framing is where we most often find the difference between a deck that lasts 25-plus years and one that turns spongy in five. This guide walks through how we frame a deck, what local inspectors look for, and the mistakes we see most often.

How We Frame a Deck, Step by Step

Framing follows the load path from the decking down to the ground. Here is the sequence we use on a typical attached deck.

1. Confirm the load path and footings. Before any lumber goes up, we verify footing locations and depths so posts land where the beam and joist layout actually need them. See our deck footings guide and footing & wind-load estimator.
2. Set the posts and beams. Posts are set plumb on the footings and the beam is built or set on top of them — never notched into the side of an undersized post. Beam size is driven by the span and the joist length it carries.
3. Attach the ledger. The ledger ties the deck to the house and must be flashed and through-bolted, not nailed. This is the single most failure-prone connection on a deck — see our ledger board guide and flashing guide.
4. Lay out and hang the joists. Joists are spaced for the decking you are using (commonly 16″ on center for wood, often 12″ on center for composite or diagonal patterns) and hung with the correct joist hangers.
5. Add blocking and bridging. Solid blocking between joists stops the lateral roll that causes bounce and keeps the frame square. We block at the beam and at mid-span on longer joists.
6. Protect the framing tops. We cap joists and beams with joist tape so water cannot sit in the fastener holes and rot the lumber from the top down.
7. Fasten with structural hardware. Hangers, tension ties, and post-to-beam connectors are installed with the manufacturer-specified structural screws or bolts. See our structural hardware guide.

What We Commonly Find on Inspections

The biggest mistake we see is joists run past their allowable span to save a beam or a row of footings. It looks fine on day one and bounces by year two. A close second is blocking left out entirely — a frame with no blocking racks side to side and telegraphs every step. One thing homeowners don’t realize is that the decking does not stiffen the frame; the frame has to be right on its own.

After years of building in coastal Virginia, we’ve also learned to treat every framing cut and hole as a place water wants to sit. Field-cut pressure-treated lumber loses its factory treatment at the cut, so we re-treat cut ends and keep the tops capped. In our salt-air environment, ordinary fasteners are not enough — more on that in our salt-air guide.

Framing for the Right Deck

How we frame depends on what goes on top. A pressure-treated wood deck and a composite deck can use different joist spacing, and picture-frame borders or diagonal boards usually call for tighter framing or added blocking — see our picture framing guide. If you are planning your project, our custom deck builder page explains how we handle design and structure together.

Frequently Asked Questions

How far apart should deck joists be?

For most wood decking, 16″ on center is standard. Composite decking and diagonal or picture-frame patterns usually need 12″ on center. Always follow the decking manufacturer’s span chart and your local code.

Can I frame a deck without a permit in Hampton Roads?

Most deck framing requires a permit and inspection under the Virginia Uniform Statewide Building Code. Requirements vary by city, so confirm with your local building department before you start.

Why does my deck bounce?

The most common causes are overspanned joists and missing blocking. Adding mid-span blocking and verifying joist span against the code chart usually solves it.

Do I need blocking between deck joists?

Yes. Blocking keeps joists from rolling, stiffens the frame, and is often required at beams and mid-span. We consider it essential, not optional.

What kind of wood is used for deck framing?

Ground-contact or above-grade rated pressure-treated lumber is standard. In our salt-air climate, we pair it with corrosion-rated hardware and protective joist tape.